#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
	int a = 0;
	int b = 0;
	int c = 0;
	while (scanf("%d %d %d", &a, &b, &c) != EOF)
	{
		if (a == b && a == c)
			printf("Equilateral triangle!");
		else if (((a == b && a != c) || (a == c && a != b) || (b == c && b != a))&& (a + b > c && a + c > b && b + c > a))
			printf("Isosceles triangle!");
		else if (a + b > c && a + c > b && b + c > a)
			printf("Ordinary triangle!");
		else
			printf("Not a triangle!");
		printf("\n");
	}
	return 0;
}